Intentional or not, it's definitely a combination of two common librarian stereotypes: librarian as mean ol' battleaxe lady always shushing people and hoarding information, and librarian as sexy geek-temptress.
As a librarian who is male and who in his entire career has neither shushed anyone nor kept anyone from accessing needed information, I'm afraid I don't conform to those stereotypes. Except for being geeky and sexy. ;-)